Key Takeaways

• PC200 is a 20-tonne class machine and PC300 is a 30-tonne class machine; their travel drives are sized to very different loads.
• The PC200-8 final drive is the 20Y-27-00500 (motor assembly 708-8F-00250); the PC300-8 is the 207-27-00590 / 207-27-00591.
• The two units differ in motor displacement, planetary reduction and bearing size — so a PC300 drive will not simply drop onto a PC200.
• Fitment is decided by machine model and part number, not by physical size or flange shape alone.
• Bolt pattern, spline and flange dimensions are the checks a buyer should confirm before ordering.
• For distributors, keeping both families in stock avoids split shipments and lost sales on mixed-brand fleets.

Table of Contents

• 1. Why these two get confused
• 2. The machines in one line
• 3. PC200 vs PC300 final drive comparison
• 4. What actually differs inside
• 5. Can a PC300 drive fit a PC200?
• 6. How to identify the right unit
• 7. Rebuild or replace
• 8. Buying and service information
• 9. Frequently asked questions

1. Why these two get confused

The Komatsu final drive family looks reassuringly similar from the outside. Both PC200 and PC300 travel motors are round, black, flange-mounted assemblies with a hydraulic motor on top and a planetary gearbox below, and in a photo the smaller one can easily be mistaken for a different angle of the larger one. The confusion matters because the two are bought for different machines, stocked under different part numbers, and priced differently. Buyers who order from a photograph, or who assume "a 20-tonne Komatsu travel motor is the 20Y one", are the ones who end up with a unit that will not bolt on. The clean way to separate them is the part number and the machine model.

2. The machines in one line

The PC200 is Komatsu's long-running 20-tonne class excavator — the model most fleets own in numbers, used for general digging, trenching and site work. The PC300 is the next size up, a 30-tonne class machine that lifts and digs more per pass and is common on heavier earthmoving and quarry work. That one class step is the whole story behind the parts difference: a heavier machine pushes harder, travels under more load, and needs a travel drive with more motor displacement, a stronger planetary reduction and larger bearings. You can see the full range on the excavator final drive page.

3. PC200 vs PC300 final drive comparison

The part-number prefix is a useful guide: Komatsu numbers beginning 20Y belong to the 20-tonne family, while 207-27 numbers belong to the larger class. It is not a rule you should bet a purchase on, but it is a fast way to sanity-check a quote.

4. What actually differs inside

Three things change as you move up a machine class. First, the hydraulic motor: a larger displacement is needed to convert the machine's higher system pressure into enough rotational torque at the track. Second, the planetary reduction: more torque passes through the gear train, so the gears, carriers and shafts are sized up and the reduction ratio is set to suit the higher travel load. Third, the bearings and seals: a heavier machine puts more radial load into the unit, so the bearing package is larger. Together these mean the PC300 unit is physically bigger and heavier, and its mounting interface is designed for a larger machine frame. Read more about the smaller unit on the Komatsu travel motor page.

5. Can a PC300 drive fit a PC200?

No, not as a straight swap. Even where a flange happens to look close, the spline, bolt circle, sprocket interface and hydraulic connections are specific to the machine. Fitting the wrong unit risks a drive that will not seat, a mismatch between motor output and the machine's travel circuit, and a failure that takes the undercarriage with it. The correct approach is always to match the machine model and the original part number, then confirm the interface dimensions before ordering. If you are unsure, send us the model, serial and a photo of the existing unit — we confirm before dispatch.

6. How to identify the right unit

• Read the machine plate. The model (PC200-8, PC300-8 and so on) fixes the class and narrows the part numbers immediately.
• Find the number on the unit. A genuine travel motor often carries its part number cast or stamped on the housing.
• Check the interface. Bolt-hole count and circle diameter, spline count and sprocket mounting are the details that decide fitment.
• Confirm the motor assembly number. The final drive housing and the motor are sometimes listed separately — make sure you are quoting the complete assembly if that is what you need.
• Use a supplier who checks. A good supplier confirms model and part number against your photo before shipping. See the full Komatsu final drive range.

7. Rebuild or replace

When a travel drive fails, the same decision applies to both classes. A rebuild renews the internal wear parts — gears, bearings and seals — inside the original housing, and suits a machine where the housing is sound and downtime is not critical. A complete replacement unit gets the machine back to work fastest and carries a warranty, which on a production machine is often worth more than the price difference. For distributors, carrying rebuilt cores on the shelf is the best of both: swap the unit, rebuild the old one later. Rebuild parts are listed on the final drive rebuild kit page.

8. Buying and service information

• How to order: send the machine model and serial, the final drive part number and a photo of the unit; we confirm fitment before dispatch.
• Testing: units are checked and measured before shipment; complete assemblies are bench-tested where applicable.
• Packing and shipping: heavy items ship in wooden export cases; air and sea freight quotable to your port.
• Warranty: 3–12 month warranty options depending on the part and grade.
• Contact: email service@gzotto.com or message us on WhatsApp at +86 153 0226 9990.

9. Frequently asked questions

Are PC200 and PC300 final drives the same?

No. They look similar but are sized for different machine classes, with different motor displacement, planetary reduction and bearings. Use the machine model and part number to choose.

What part number is the PC200-8 final drive?

The PC200-8 travel motor is commonly listed as 20Y-27-00500, with the motor assembly under 708-8F-00250. Always confirm against your machine and unit markings.

What is the PC300-8 travel motor part number?

The PC300-8 travel motor is commonly listed as 207-27-00590 or 207-27-00591. Confirm the interface details before ordering.

Can I fit a larger final drive to get more power?

No. Fitting a unit from a larger machine is not a valid upgrade — the interfaces and the machine's travel circuit are matched to the original size. Wrong-size units cause fitment and reliability problems.

Do you supply both PC200 and PC300 travel motors?

Yes. We stock complete travel motors and final drives for both families, plus rebuild parts, with pre-shipment checking and worldwide shipping.

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